Originally Posted by 97Powerstroke
A big concern with these nest and other brands of tstats is they are connected to your home wireless network. Without properly setting up your wireless network, anyone with a phone or laptop can sit outside your house and hop on your network. The Nest has an unoccupied and occupied mode which can tell intruders when you are home and not home. Technology is great but everyone has to do their diligence to keep the bad guys away.
Got to agree with this (I know a thing or two about IT and security risks). If it was me I'd probably look more into a Honeywell programmable thermostat with Z-Wave for a home though. My reasoning is because that will also tie into home automation better allowing you to power on/off receptacles, monitor and adjust your thermostat, lock a house door, and even open/close a garage door (additional wiring requied). What can be really cool about this is if you couple it with something like TotalConnect you can tie it all into your wireless, add cellular backup and adjust/monitor from anywhere via a mobile app (monthly service fee required.)
I use TotalConnect for my alarm system (have the Z-Wave module but have not done automation yet). Love it!
But anyway, if you are just looking at a smart thermostat, read this: